import java.awt.Color;
  import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.TextField;

  import javax.swing.JButton;
  import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 import java.text.ParseException; 
  import java.util.Scanner;

   public class calculator_gui<reutrn> implements ActionListener {

JFrame frame = new JFrame("Calculator");
JPanel Panel = new JPanel (new java.awt.FlowLayout());

JTextArea text = new JTextArea(1,20);
JButton but1= new JButton("1");
JButton but2= new JButton("2");
JButton but3= new JButton("3");
JButton but4= new JButton("4");
JButton but5= new JButton("5");
JButton but6= new JButton("6");
JButton but7= new JButton("7");
JButton but8= new JButton("8");
JButton but9= new JButton("9");
JButton but0= new JButton("0");


JButton butadd= new JButton("+");
JButton butsub= new JButton("-");
JButton butmulti= new JButton("*"); 
JButton butdiv= new JButton("/");
JButton buteq= new JButton("=");
JButton butclear= new JButton("C");

Double number1,number2,result;
int addc=0,subc=0,multic=0,divc=0;



public void gui(){

    Panel.setLayout(FlowLayout());
    frame.setVisible(true);
    frame.setBounds(100, 100, 450, 285);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     //  frame.setResizable(false);

    frame.add(Panel);
    Panel.setBackground(Color.green);

    Panel.add(text);
    text.setBounds(10, 32, 361, 29);



    Panel.add(but1);
    but1.setBackground(Color.red);
    but1.setBounds(10, 81, 89, 23);

    Panel.add(but2);
    but2.setBounds(126, 81, 89, 23);

    Panel.add(but3);
    but3.setBounds(225, 81, 89, 23);

    Panel.add(but4);
    but4.setBounds(10, 115, 89, 23);

    Panel.add(but5);
    but5.setBounds(126, 115, 89, 23);

    Panel.add(but6);
    but6.setBounds(225, 115, 89, 23);

    Panel.add(but7);
    but7.setBounds(10, 149, 89, 23);

    Panel.add(but8);
    but8.setBounds(126, 149, 89, 23);

    Panel.add(but9);
    but9.setBounds(225, 149, 89, 23);

    Panel.add(but0);
    but0.setBounds(126, 183, 89, 23);

    Panel.add(butadd);
    butadd.setBounds(324, 81, 89, 23);

    Panel.add(butsub);
    butsub.setBounds(324, 115, 89, 23);

    Panel.add(butmulti);
    butmulti.setBounds(324, 183, 89, 23);

    Panel.add(butdiv);
    butdiv.setBounds(324, 149, 89, 23);

    Panel.add(buteq);
    buteq.setBounds(225, 183, 89, 23);

    Panel.add(butclear);
    butclear.setBounds(10, 183, 89, 23);





    but1.addActionListener(this);
    but2.addActionListener(this);
    but3.addActionListener(this);
    but4.addActionListener(this);
    but5.addActionListener(this);
    but6.addActionListener(this);
    but7.addActionListener(this);
    but8.addActionListener(this);
    but9.addActionListener(this);
    but0.addActionListener(this);
    butadd.addActionListener(this);
    butsub.addActionListener(this);
    butmulti.addActionListener(this);
    butdiv.addActionListener(this);
    buteq.addActionListener(this);
    butclear.addActionListener(this);






}

private LayoutManager FlowLayout() {
    // TODO Auto-generated method stub
    return null;
}

@Override
public void actionPerformed(ActionEvent e){

  Object source = e.getSource();

  if(source==butclear){

      number1=0.0;
      number2=0.0;
      text.setText(null);

  }


  if(source==but1){  
       text.append("1");        

  }


  if(source==but2){  
       text.append("2");        

  }

  if(source==but3){  
       text.append("3");        

  }

  if(source==but4){  
       text.append("4");        

  }

  if(source==but5){  
       text.append("5");        

  }

  if(source==but6){  
       text.append("6");        

  }

  if(source==but7){  
       text.append("7");        

  }

  if(source==but8){  
       text.append("8");        

  }

  if(source==but9){  
       text.append("9");        

  }

  if(source==but0){  
       text.append("0");        

  }
  if(source==butadd){
      number1=number_reader();
      text.setText("");
      addc=1;
      subc=0;
      multic=0;
      divc=0;


  }

  if(source==butsub){
      number1=number_reader();
      text.setText("");
      addc=0;
      subc=1;
      multic=0;
      divc=0;


  }
  if(source==butmulti){
      number1=number_reader();
      text.setText("");
      addc=0;
      subc=0;
      multic=1;
      divc=0;


  }
  if(source==butdiv){
      number1=number_reader();
      text.setText("");
      addc=0;
      subc=0;
      multic=0;
      divc=1;


  }



  if(source==buteq){

      number2=number_reader();
      if(addc>0){
          result=number1+number2;
          text.setText(Double.toString(result));

      }

  if(subc>0){
      result=number1-number2;
      text.setText(Double.toString(result));          
  }

  if(multic>0){
      result=number1*number2;
      text.setText(Double.toString(result));

  }




    }







     if(divc>0){
      result=number1/number2;
      text.setText(Double.toString(result));

           }


       }




public double number_reader(){
    Double num1;
    String s;
    s=text.getText();
    num1=Double.valueOf(s);

    return  num1;


        }




      }